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Ruby isn't dead and like all alive things, it grows and changes; your expectation is out of date. https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-relea

• jupp0r 2y ago
  Unfortunately, 5 years after the release you linked, almost none of this has made it to Rails or even to relatively new libraries this post is about. The reason (imho) are unfortunate design choices in how the language incorporates concurrency - it’s just not well done.